Originally, observations of galaxies through weak lensing by the CFHTLenS collaboration have indicated that the \(\Lambda \) CDM model predicts a \(S_8\)  value that is larger than the direct measurement at the \(2\sigma \)  level [1]}, [2]}.
This tension has since then been further established within the KiDS/Viking data [3]}, [4]}, but is milder within the DES data [5]}.
However, a re-analysis of the DES data, combined with KiDS/Viking, leads to a determination of \(S_8\)  that is discrepant with Planck at the \(3\sigma \)  level, \(S_8=0.755_{-0.021}^{+0.019}\)  [4]}.
Recently, the combination of KiDS/Viking and SDSS data has established \(S_8=0.766^{+0.02}_{-0.014}\)  [7]}. However, a study in [8]} shows fainter \(S_8\)  tension when redshift-space distortions (RSD) data is inlcuded.
